A state of the art amp expandable surveillance system with video technology equivalent to 720p hd resolution set amp forget by recording continuously from 4 channels for 30 days onto a 500gb hard drive even longer with motion detection seeing is believing with 2 x 720p hd cameras 1 megapixel perfect for front amp back door areas amp more expand by adding up to any 2 swann pro axxx cameras of your choice for full 4 channel monitoring save time amp have peace of mind by easily locati